Semi-automatic system for washing a building

ABSTRACT

A cleaning brush apparatus that is mountable onto a platform that is suitably suspended from a building for cleaning exterior and/or interior surfaces of the building. The cleaning brush apparatus includes a cleaning brush that is rotatable relative to the platform about a rotation axis that is parallel to the longitudinal axis of the platform. The cleaning brush apparatus is mounted to the platform in a manner to define a walkway on the platform to the rear of the rotation axis that permits a human operator to walk on the platform behind the rotation axis and along at least a length of the cleaning brush apparatus. The cleaning brush apparatus may also be adjustably mounted on the platform to permit the cleaning brush apparatus to be adjusted in position on and relative to the platform in a direction parallel to the longitudinal axis.

This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/381,366, filed Aug. 30, 2016 the entire contents of which are incorporated herein by reference.

FIELD

This disclosure relates to apparatus, systems and methods for cleaning surfaces, including exterior and interior surfaces, of a building.

BACKGROUND

Building structures, particularly tall urban buildings and skyscrapers, are frequently washed manually. This is often done by suspending a window washer operator alongside a building via a suspended platform (i.e., a swing stage or suspended scaffolding). However, manually washing windows can be time consuming and the effectiveness can be entirely dependent upon the skill of the window washer.

SUMMARY

An apparatus is described that can cleans exterior and/or interior surfaces of a building. The apparatus is mountable onto a platform that is suitably suspended from the building for cleaning the surfaces. The apparatus together with the platform can be referred to as a cleaning system. The surfaces can be any surfaces of the building including exterior surfaces and interior surfaces. The surfaces can include, but are not limited to, glass surfaces such as windows and non-glass surfaces such as surfaces between or next to windows, for example mullions and facades. The non-glass surfaces can be stone, metal, plastic or other materials used to form surfaces of buildings. The surfaces may be vertical surfaces or surfaces that are angled relative to vertical. The surfaces may also be horizontal surfaces.

The cleaning system is semi-automatic in that at least one human operator is present on the platform during operation of the apparatus while cleaning. The human operator on the platform can perform a variety of tasks including, but not limited to, modify operation of the apparatus as needed, perform touch-up cleaning work, control upward and downward movement of the platform relative to the building, engage stabilization anchors to stabilize the platform relative to the building, and monitor whether the platform is suitably stabilized relative to the building.

In one cleaning system described herein, the cleaning system includes a cleaning brush apparatus that is mounted to a platform having a longitudinal axis. The cleaning brush apparatus includes a cleaning brush that is rotatable relative to the platform about a rotation axis that is horizontal and parallel to the longitudinal axis of the platform. The cleaning brush apparatus is mounted to the platform in a manner to define a walkway on the platform to the rear of the rotation axis that permits a human operator to walk on the platform behind the rotation axis and along at least a length of the cleaning brush apparatus. For example, the cleaning brush apparatus can be mounted to a front wall or frame of the platform. Sufficient space is left on the platform behind the cleaning brush apparatus to define the walkway to allow the human operator to walk along the platform along at least a length of the cleaning brush apparatus, for example along the entire length of the brush or from one end of the platform to the other end.

In another cleaning system described herein, the cleaning system includes a cleaning brush apparatus that is mounted to a platform having a longitudinal axis. The cleaning brush apparatus includes a cleaning brush that is rotatable relative to the platform about a rotation axis that is parallel to the longitudinal axis of the platform. The cleaning brush apparatus can be slidably mounted on the platform, for example on the front wall or frame thereof, to permit the cleaning brush apparatus to be adjusted in position on the platform in a direction parallel to the longitudinal axis.

In another example of the cleaning brush system, the cleaning brush may be mounted, including slidably mounted, on the platform such that the rotation axis of the cleaning brush may be vertical or generally vertical and perpendicular or generally perpendicular to the longitudinal axis of the platform. In this example, the walkway may still be defined on the platform to the rear of the rotation axis that permits a human operator to walk on the platform behind the rotation axis.

The cleaning brush apparatus described herein may be intended to be permanently installed or mounted on the platform whereby the cleaning brush apparatus is intended to remain mounted on the platform after the cleaning operation is completed. Alternatively, the cleaning brush apparatus may be intended to be removably installed or mounted on the platform whereby the cleaning brush apparatus is intended to be removed from the platform after the cleaning operation is completed and thereafter mounted onto another platform.

The platform can be any type or style of platform that can be suspended from a building, either outside the building or inside the building, and can be controllably raised and lowered relative to the building, on which at least one human operator can reside during the cleaning operation, and on which a cleaning brush apparatus as described herein can be mounted. Examples of the types of platforms that can be used include, but are not limited to, platforms used with davit type systems, platforms used with building maintenance units, and platforms used with temporary rigging. The platform can be a permanent installation on the building where the platform is intended to remain on or in the building after the cleaning operation is completed, or the platform can be a temporarily installed platform where the platform is intended to be removed from the building after the cleaning operation is completed, for example transported to another building for a cleaning operation. The mechanism for raising and/or lowering the platform, such as the davit system or crane can be a permanent fixture of the building, or the mechanism can be a temporary mechanism that is intended to be removed when the cleaning job is completed, such as a temporary roof-top rig.

In one aspect of the present disclosure, a cleaning system for cleaning a surface, for example an upright surface, of a structure is disclosed. The cleaning system includes a platform that includes at least one operator station. The platform is adapted to move along the surface during cleaning. The platform is positionable along the surface along a length of the platform. The cleaning system also includes a cleaning brush apparatus that has one or more cleaning brushes that are adapted to contact the surface during cleaning. The cleaning brush apparatus is supported by the platform along at least a portion of the length of the platform. The cleaning system also includes a hoist system, such as a davit system, a building maintenance unit or a temporary roof top rig, constructed and arranged to move the platform along the surface of the structure with lift cables.

In another aspect of the present disclosure, a cleaning system for cleaning a surface, for example an upright surface, of a structure is disclosed. The cleaning system includes a platform that includes at least one operator station and a railing at least partially surrounding the operator station. The platform is adapted to move along the surface during cleaning. The platform is also positionable along the surface along a length of the platform. The cleaning system also includes securing features attached to the platform. The securing features are configured to secure the platform to the surface. The cleaning system also includes a powered cleaning brush apparatus that includes one or more cleaning brushes adapted to contact the surface during cleaning. The powered cleaning brush apparatus is supported by the platform along at least a portion of the length of the platform. The cleaning system also includes a hoist system, such as a davit system, a building maintenance unit or a temporary roof top rig, attached to the platform. The hoist system is configured to move the platform along the surface of the structure with lift cables.

In another aspect of the present disclosure, a cleaning system for cleaning a surface, for example an upright surface, of a structure is disclosed. The cleaning apparatus includes a platform that includes at least one operator station and a railing at least partially surrounding the operator station. The platform is adapted to move along the surface during cleaning. The platform is positionable along the surface along a length of the platform and the operator station extends along the length of the platform. The cleaning system also includes securing features attached to the platform. The securing features are configured to secure the platform to the surface. The cleaning system also includes a powered cleaning brush apparatus that includes one or more cleaning brushes adapted to contact the surface during cleaning. The powered cleaning brush apparatus is supported by the platform along at least a portion of the length of the platform. The cleaning system also includes a hoist system attached to the platform. The hoist system is configured to move the platform along the surface of the structure with lift cables.

DRAWINGS

The following drawings are illustrative of particular embodiments of the present disclosure and therefore do not limit the scope of the present disclosure. The drawings are not to scale and are intended for use in conjunction with the explanations in the following detailed description. Embodiments of the present disclosure will hereinafter be described in conjunction with the appended drawings, wherein like numerals denote like elements.

FIG. 1 illustrates a perspective view of a cleaning system described herein.

FIG. 2 illustrates a side view of the cleaning system of FIG. 1.

FIG. 3 illustrates a schematic side view of a cleaning system described herein with a cleaning brush in a lowered position.

FIG. 4 illustrates a schematic side view of the cleaning system of FIG. 3 with the cleaning brush in a raised position.

FIG. 5 illustrates another schematic side view of the cleaning system of FIG. 3 without a cleaning brush frame and with the cleaning brush in a lowered position.

FIG. 6 illustrates a schematic side view of the cleaning system of FIG. 5 with the cleaning brush in a raised position.

FIG. 7 illustrates a schematic side view of a cleaning system described herein with a cleaning brush in a lowered position.

FIG. 8 illustrates a schematic side view of the cleaning system of FIG. 7 with the cleaning brush in a raised position.

FIG. 9 illustrates a schematic side view of a cleaning system described herein.

FIG. 10A illustrates a schematic side view of a cleaning system described herein.

FIG. 10B is another view of the cleaning system of FIG. 10A.

FIG. 11 illustrates a schematic top view of a cleaning system described herein.

FIG. 12 illustrates a perspective view of another cleaning system described herein.

FIG. 13 is a close-up, detailed perspective view of a front portion of the cleaning system in FIG. 12.

FIG. 14 is a close-up, detailed perspective view of a rear portion of the cleaning system in FIG. 12.

FIG. 15 is a side view of the cleaning system of FIG. 12.

FIG. 16 is a perspective view of another cleaning system described herein.

DETAILED DESCRIPTION

Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.

FIG. 1 illustrates a perspective view of a cleaning system 100. FIG. 2 illustrates a side view of the cleaning system 100. The cleaning system 100 is shown on an upright exterior surface 102 of a structure 104. However, the cleaning system 100 clean non-upright surfaces such as angled surfaces or horizontal surfaces. In addition, the cleaning system 100 can also be suspended from the building to clean an interior surface of the building. For sake of convenience, the cleaning systems described herein may be described as being suspended over a side of a building for cleaning exterior surfaces. However, the cleaning systems described herein can be suspended within a building cleaning interior surfaces.

The cleaning system 100 includes a platform 106 (i.e., suspended platform, swing stage, suspended scaffolding, etc.), a cleaning brush apparatus 108 supported by the platform 106, and a hoist system 110. In one example, the cleaning brush apparatus 108 is a powered cleaning brush apparatus 108 having one or more cleaning brush elements 134 that are driven relative to the platform 106 by a power source. In certain examples, the cleaning brush element(s) 134 is/are driven in a rotary motion relative to the platform 106. In certain examples, the power source includes one or more motors such as one or more electric motors, or one or more combustion engines. In some examples the cleaning system 100 is a specialty manufactured apparatus. In some examples, the cleaning brush apparatus 108 can be an add-on device that can be added to an existing platform 106 to temporarily or permanently retrofit the platform 106. Alternatively, the cleaning brush apparatus can be incorporated into the platform 106 at the time the platform 106 is initially manufactured. In other examples, an existing pre-manufactured platform 106 can be modified by mounting the cleaning brush apparatus 108 thereon to form the cleaning system 100.

The structure 104 can be any building, such as a skyscraper or high-rise building, or a low-rise building, that may be cleaned. The upright exterior surface 102 can be the side of the building including, for example, windows or the structure of the building between the windows. The surface 102 can be any exterior surface of the building including, but not limited to, glass surfaces such as windows and non-glass surfaces such as surfaces between or next to windows, for example mullions and facades. The non-glass surfaces can be stone, metal, plastic or other materials used to form surfaces of buildings. The exterior surface 102 may be a vertical surface or a surface that is angled relative to vertical. The exterior surface 102 may also be a horizontal surface.

The structure 104 has a roof 112 and is resting on a ground surface 114 (shown in FIG. 2). It should be understood that the ground surface 114 can be anything that the structure 104 is resting on, including, other parts of the building, for example a tiered building having other intermediate setbacks or roofs. In addition, in the depicted embodiment, the roof 112 includes a parapet wall 116 positioned at the edge of the roof 112 and raised above the roof 112. In addition, the roof 112 illustrated can be something other than the very highest ultimate roof of the building, but could be intermediate setbacks or intermediate roofs.

The cleaning system 100 is shown cleaning the upright surface 102 of the structure 104. The cleaning system 100 is configured to move in a vertical direction 118 along the upright surface 102 during cleaning. The cleaning system 100 is generally movable in the vertical direction 118 by the hoist system 110.

The platform 106 of the cleaning system 100 is configured to support the cleaning brush apparatus 108. The platform 106 may also be referred to as a suspended platform, a swing stage or suspended scaffolding. The platform 106 can be any type or style of platform that can be suspended over a side of a building and that can be controllably raised and lowered relative to the building, on which at least one human operator can reside during the cleaning operation, and on which a cleaning brush apparatus can be mounted.

The platform 106 is connected to and is movable by the hoist system 110. The platform 106 has a front side 124 and a back side 126 separated by a width W. The front side 124 and the back side 126 define a length L of the platform 106 which is greater than the width W. The platform 106 is positionable along the upright surface 102 along the length L of the platform 106. When in operation, the front side 124 of the platform 106 is closest to the upright surface 102 of the structure 104. When not in operation, the platform 106 can be moved along a flat surface such as the roof 112 using wheels 107 mounted at a bottom side 109 of the platform 106. In some embodiments, the wheels 107 are lockable so as to prevent the platform 106 from inadvertently rolling along a flat surface.

The platform 106 also includes at least one operator station 128. In the depicted embodiment, the platform 106 includes two operator stations 128, 130. In other embodiments, the platform 106 includes more than two operator stations 128, 130. In some embodiments, a single operator can occupy an operator station. In other embodiments, multiple operators can occupy an operator station. The operator stations 128, 130 are spaces that operators can occupy while the cleaning system 100 is being operated. The operator stations 128, 130 allow the operator(s) access to the different components of the cleaning system 100. For example, the operator stations 128, 130 can be configured to allow the operator(s) access to the cleaning brush apparatus 108 to control its operation and or to portions of the hoist system 110 to operate the motion of the platform 106. In some embodiments, the operator stations 128, 130 include tethering locations for the operator to secure himself to the cleaning system 100. In one example, the operator stations 128, 130 can be at the ends of the platform 106 with the cleaning brush apparatus 108 between the stations 128, 130. In another example, an operator station 128, 130 can be provided at only one end of the platform 106. The operator(s) can ensure the platform 106 is properly secured to the upright surface 102. For example, an operator can adjust a tie-in system (which at times can jam in their corresponding guides) and can, where appropriate, tether the platform 106 to the structure 104 with lanyards.

The operator stations 128, 130 include a railing 132 and a floor 133. The railing 132 at least partially surrounds the operator stations 128, 130 and helps to retain the operator within the operator stations 128, 130 of the platform 106. In some embodiments, a top of the 132 railing is at least about four feet from the floor 133. The floor 133 of the operator stations 128, 130 are configured to provide a rigid support for the operator to support himself upon.

The operator stations 128, 130 of the platform 106 are positioned adjacent the cleaning brush apparatus 108 and extend along at least a portion of the length L of the platform 106. In some embodiments, the platform 106 includes a single operator station 128 that extends along a portion of the length L of the platform 106. In other embodiments, the platform 106 includes a single operator station 128 that extends along the entire length L of the platform 106. In other embodiments still, the platform 106 includes multiple operator stations 128, 130 that extend along a portion of the length L of the platform 106. In some embodiments, the operator stations 128, 130 are connected to one another so that an operator can travel between operator stations 128, 130. In some embodiments, the operator stations 128, 130 are connected to one another by way of a walkway. In some embodiments, the walkway is positioned at the back side 126 of the platform 106. In some embodiments, the walkway is another platform attached to the backside 126 of the platform 106. In some embodiments, the operator can travel underneath the cleaning brush apparatus 108 so as to gain access to both operator stations 128, 130.

The platform 106 can also include an obstruction bar positioned at a bottom side 109 of the platform 106. The obstruction bar is configured to alter the operations of the cleaning system 100 when the obstruction bar contacts an obstruction upon the upright surface 102. In some embodiments, the obstruction bar can control the operation of the hoist system 110 and the operation of the cleaning brush apparatus 108 so that when an obstruction is encountered, the obstruction bar automatically shuts down the operation of the hoist system 110 and/or the cleaning brush apparatus 108. The obstruction bar interfaces with mechanical or electronic control devices such that actuation of the bar by an obstruction causes the hoist system 110 and/or the cleaning brush apparatus 108 to shut down. In the case where the cleaning brush apparatus 108 is a retrofit device used to retrofit an existing platform 106 by adding the cleaning brush apparatus 108 to the bottom of the platform 106, the existing wheels and obstruction bar of the platform 106 can be removed to facilitate mounting the cleaning brush apparatus 108. In such a case, the cleaning brush apparatus 108 can include an obstruction bar that performs the same function as the obstruction bar removed from the platform 106.

With continued reference to FIGS. 1 and 2, the cleaning brush apparatus 108 is adapted to contact the upright surface 102 during cleaning. Specifically, the cleaning brush apparatus 108 is configured to automatically clean the upright surface 102 of the structure 104 as the cleaning system 100 travels in the direction 118 along the upright surface 102 during operation. The cleaning brush apparatus 108 uses a power source, such as a battery, power cord or other external power source, and a water source (i.e. a hose) along with a spray nozzle to clean the upright surface 102. In some examples, the power cord and hose can be routed from the roof top. Automatic window washing systems have been described in U.S. Pat. No. 8,434,504; US 2014/0109932; U.S. Pat. No. 6,158,678; U.S. Pat. No. 5,249,326; U.S. Pat. No. 5,901,720; U.S. Pat. No. 5,890,250; U.S. Pat. No. 8,790,468; U.S. Pat. No. 7,972,446; U.S. Pat. No. 6,550,090; U.S. Pat. No. 6,170,109; U.S. Pat. No. 7,665,173; and U.S. Provisional Application Ser. No. 62/346,261, filed Jun. 6, 2016, entitled “WASHING APPARATUS AND METHODS,” and having Attorney Docket No. 17612.0001USP1, the entire disclosures of which are incorporated herein by reference. In the depicted embodiment, a pair of fans or thrusters are shown on the cleaning brush apparatus 108; however, such fans are optional.

The cleaning brush apparatus 108 for the cleaning system 100 can include a cleaning brush element 134 adapted to contact the upright surface 102, such as the side of the building, during cleaning. In the example shown, the cleaning brush element 134 can be rotatable about an axis 136. In some embodiments, the cleaning brush element 134 is rotatable about the axis by way of a single motor or a plurality of motors (not shown). The axis 136 will be generally parallel to the upright surface 102, generally parallel to the longitudinal axis of the platform 106, generally in a horizontal direction and extend generally about the length L of the platform 106. The cleaning brush element 134, as shown, can generally extend along least a portion of the length L of the platform 106. In some embodiments, the cleaning brush element 134 extends about the full length L of the platform 106. In some embodiments, the cleaning brush element 134 extends more than the full length L of the platform 106 and extends past the platform 106. The cleaning brush element 134 can be a pad-type brush, a type of brush often used in commercial carwashes (e.g., having flexible radial cleaning elements such as strips, flaps, etc.), or other similar cleaning element.

In certain examples, the cleaning brush apparatus 108 can be mounted above the platform 106, below the platform 106 or at a front side 124 of the platform 106. In some examples, the length of the cleaning brush apparatus 108 can be shorter than the length L of the platform 106 or longer than the length L of the platform 106. In some examples, the position of the cleaning brush apparatus 108 can be adjusted along the length of the platform 106; in such cases the cleaning brush apparatus 108 can have a counterbalance system that adjusts the balance of the platform 106 as the cleaning brush apparatus 108 is moved.

The cleaning brush apparatus 108 includes a frame 138 to which the cleaning brush element 134 is rotatably attached. The frame 138 is configured to be supported by the platform 106. Specifically, the frame 138 is secured to the platform 106. In some embodiments, the frame 138 is pivotally mounted to the platform 106. In other embodiments, the frame 138 is immovably mounted to the platform 106. In still other embodiments, the frame 138 is slidably mounted to the platform 106 so as to allow the cleaning brush apparatus 108 to be positioned at a variety of different locations along the length L of the platform 106. In the depicted embodiment, the frame 138 of the cleaning brush apparatus 108 is mounted to and on top of the rails 132 of the platform 106. In some embodiments, the frame 138 of the cleaning brush apparatus 108 is mounted at the bottom side 109 of the platform 106.

With continued reference to FIGS. 1 and 2, the cleaning system 100 includes the hoist system 110 that is constructed and arranged to move the platform 106 along the upright surface 102 of the structure 104 with lift cables 142, 144. The hoist system 110 is configured to attach the platform 106 to a lift system 146 positioned on the roof 112.

The hoist system 110 includes at least one winch 148 attached to the platform 106. In some embodiments, the winch 148 is positioned at either end of the platform 106 and operated by the operator from either operator station 128, 130. In some embodiments, the winch 148 can be operated remotely. The winch 148 helps to control and move the lift cable 142 in order to move the platform 106 vertically relative to the upright surface 102, e.g., along the direction 118 of FIG. 1. In some embodiments, the other cable 144 not attached to the winch 148 can be attached to an automatic spool or another winch 150. In some embodiments, the winches 148, 150 are constructed and arranged so as to operate in unison so as to keep the platform 106 generally level with horizontal as the platform 106 travels along the upright surface 102. In some examples, the winch/winches can be located on the platform 106 or on the roof 112 (e.g., mounted to portions of the lift system 146 or incorporated as part of a hoist or crane of an existing building maintenance unit).

The cables 142, 144 are also attached to the lift system 146. The lift system 146 includes a pair of base members 152, 154 that are constructed and arranged to interface with the roof 112 so as to provide stability to the platform 106 during operation. The base members 152, 154 can also be referred to as davit arms and can be configured to mate with preexisting fixed features in the roof 112 of the structure (e.g. the davit arms). Such preexisting features include channels, apertures, or other similar like receiving features. In other embodiments, the cables 142, 144 are attached to an elevated crane hoist system fixed to the roof. Such a crane hoist system can be configured to lift the platform 106 over the parapet wall 116 and onto the roof 112 for both deploying and taking in the platform 106. In some embodiments, the platform 106 can be deployed from the roof 112. In other embodiments, the platform 106 can be lifted from the ground 114. In other embodiments, a parapet clamp system that clamps to the parapet wall 116 can be used to suspend the platform from the building.

The first base member 152 is configured to be positioned on the roof 112 adjacent the parapet wall 116 and be attached to the first lift cable 142. The first base member 152 also includes a weighted outrigger 156 that is spaced away from the first base member 152 and the parapet wall 116. Weight can be added to the weighted outrigger 156 so that proper washing apparatus stability can be achieved depending on both weather conditions (e.g., wind) and the contents of the platform 106 and the cleaning brush apparatus 108 (fluids, tools, operators, etc.).

The second base member 154 is positioned adjacent to the parapet wall 116 of the roof 112 and is attached to the second lift cable 144. In some embodiments, the second base member 154 is clamped to the wall 116. In some embodiments, the second base member 154 can include rigging 158 so as to further anchor the second base member 154 to the roof 112.

As shown in FIG. 2, the cleaning system 100 can include a securing system 160 for retaining the washing apparatus 100 against the upright surface 102 of the structure 104. The securing system 160 can include a variety of different features to allow the platform 106 of the cleaning system 100 to be secured to the upright surface 102 to aid in reducing the likelihood of the platform 106 from swinging along the upright surface 102 or away from the upright surface 102. Stabilization can be provided by tethers having elements received in vertical mullion guides incorporated into the upright surface 102 or by lanyards that attach to discrete tie-in locations integrated at the upright surface 102.

For example, the securing system 160 can include at least one guide 162 that is configured to travel within a channel or corresponding guide (not shown) on the upright surface 102. In some embodiments, the securing system 160 includes a plurality of guides 162 positioned at the front side 124 of the platform 106.

In some embodiments, the securing system 160 can be a mullion guide system. In such an embodiment, the guide(s) 162 is configured to travel within a mullion guide track(s) (not shown) attached to the upright surface 102 of the structure 104. In some embodiments, the guide(s) 162 include rollers (not shown) so as to allow the guide(s) 162 to slide within the mullion track(s). The mullion track and guides 162 are configured to withstand a force from any direction to aid in retaining the platform 106 against the upright surface 102 of the structure 104. In some embodiments, the platform 106 includes a plurality of the guides 162 positioned at the front side 124 of the platform 106. The guides 162 can be adjustable and movable along the front side 124 of the platform 106 to as to accept a variety of different mullion tracks widths on different upright surfaces 102 of different structures 104.

In another example, the securing system 160 can include anchor points to allow the operator to anchor the platform 106 to the upright surface 102 of the structure 104. The upright surface 102 can include sets of tie-in point or loops. In some embodiments, the platform 106 includes relatively short lanyards that hook/secure into the tie-in points. In other examples still, the platform 106 can use a guide line 164 that is routed along the height of the upright surface 102 of the structure 104 and tethered to the platform 106 and to a point at the roof 112. In such an example, the guide line 164 can be periodically anchored to the upright surface 102, thereby reducing the opportunity for the platform 106 to swing away from or along the upright surface 102.

FIGS. 3 and 4 show schematic side views of a cleaning system 200 according to one embodiment of the present disclosure. Similar to the cleaning system 100 described above, the cleaning system 200 includes a platform 206 with an operator station 228; a cleaning brush apparatus 208 supported by the platform 206; and a securing system 260 for securing the platform 206 to the upright surface 102. In some embodiments, the cleaning system 200 can also include a hoist system for attaching the platform 206 to a lift system at the roof of the structure 104. Both the hoist system and lift systems of the washing apparatus 200 can be substantially similar to those described above (i.e., hoist system 110 and lift system 146) and therefore will not be described in further detail here.

As shown, an operator 201 is positioned within the operator station 228 on the platform 206. Further, the operator station 228 includes rails 232 that extended to a height above a floor 233 so as to aid in retaining the operator 201 within the operator station 228 during operation.

The platform 206 has a front side 224 and a back side 226. The front side 224 is constructed and adapted to be closely positioned adjacent the upright surface 102 during the operation of the cleaning system 200. Further, as part of the securing system 260, at the front side 224, at least one guide 262 is positioned to allow the platform 206 to be supported and connected to the upright surface 102. In some embodiments, the guide 262 is a mullion guide 262 that is configured to be received by an additional mullion guide or track along the upright surface 102.

The cleaning brush apparatus 208 is pivotally connected to the platform 206 by way of at least one support arm 268 to allow the cleaning brush apparatus 208 to be pivoted toward and away from the upright surface 102 via a pivot point 270 at a side of the platform 206 between a raised (FIG. 4) and lowered (FIG. 3) position. In some embodiments, the pivoting of the cleaning brush apparatus 208 can be done automatically via a motor or via a counterforce such as weights. In other embodiments, the pivoting of the cleaning brush apparatus 208 about the pivot point 270 can be done manually by way of a rope or other similar method. In some embodiments, the at least one support arm 268 is lockable so as to preserve the position of the cleaning brush apparatus 208 in a desired orientation. In other embodiments, the opposite side of the cleaning brush apparatus 208 includes a second support arm (similar to the support arm 268) that is configured to move in unison with the first support arm 268. The cleaning brush apparatus 208 includes a cleaning brush element 234, a shroud 235, a spray nozzle 237, and a frame 238 with an obstruction bar 239. In some examples, the obstruction bar 239 replaces the obstruction bar that would ordinarily be positioned at the bottom of the platform 206 and provides the same function of being able to control certain operations of the cleaning brush apparatus 208 and the platform 206, similar to the obstruction bar described above with respect to the platform 106.

The cleaning brush element 234 is substantially similar to the cleaning brush element 134 described above and is rotatable relative to the frame 238 of the cleaning brush apparatus 208. The shroud 235 is configured to at least partially surround the cleaning brush element 234 to prevent unwanted overspray caused by the rotation of the cleaning brush element 234. The spray nozzle 237 is configured to deliver a liquid from a liquid source (i.e., a tank or water hose) to the upright surface 102. The frame 238 is configured to rotatably hold the cleaning brush element 234 and to attach to the support arm 268 for mounting the cleaning brush apparatus 208 to the platform 206. Further, the obstruction bar 239 of the frame 238 is configured to protect the spray nozzle 237 from obstructions along the upright surface 102, such as ledges.

During operation alongside the upright surface 102, the cleaning brush apparatus 208 is in a lowered position, as shown in FIG. 3 so that the cleaning brush element 234 contacts the upright surface 102. Further, at such a time, the securing system 260 is configured to help aid in securing the platform 206 to the upright surface 102. When the cleaning operation is complete and the platform 206 is either positioned near the ground 144 (see in FIG. 2) or near the parapet wall 116 at the roof 112 (seen in FIGS. 1 and 2), the cleaning brush apparatus 208 is pivoted to the raised position, as shown in FIG. 4. This allows the platform 206 to sit flat on the ground or on the roof. Further, by pivoting the cleaning brush apparatus 208 to the raised position, the cleaning system 200 is reduced in height, thereby making the platform 206 easier to rise above the parapet wall 116 or above an edge of the roof 112.

FIGS. 5 and 6 show schematic side views of the cleaning system 200. The cleaning system 200 is generally identical to that shown in FIGS. 3 and 4 with the exception of the support bar 268 being attached directly to the cleaning brush element 234 of the cleaning brush apparatus 208 instead of to the frame 238 which is removed. As shown, the cleaning brush apparatus 208 still includes the obstruction bar 239 but does not include the frame 238 from FIGS. 3 and 4. FIG. 6 shows the cleaning brush apparatus 208 in a partially raised position.

FIGS. 7 and 8 show schematic side views of a cleaning system 300. The cleaning system 300 is similar to the cleaning system 200 described above in FIGS. 3-6 with the exception of an extended support arm 368 to support a cleaning brush apparatus 308 and a pivot point 370 located at a bottom side 309 of a platform 306. The extended support arm 368 and pivot point 370 allow the cleaning brush apparatus 308 to pivot and hang in the operating position (FIG. 7) with the support bar 368 in a generally vertical orientation. This reduces strain on the pivot point 370 by the support arm 368 when the cleaning structure 308 is in the operation position. Further, it also reduces the need to heavily brake or lock the support arm 368 in place in the operating position. However, the cleaning brush of the cleaning brush apparatus 308 can be pivoted to a raised or retracted position (FIG. 8) by pivoting the support bar 368 so that the support bar 368 is perpendicular to the upright surface 102 or parallel to the floor of the platform 306.

FIG. 9 shows schematic side view of a cleaning system 400. The cleaning system 400 is similar to the cleaning systems 100, 200, 300 described above with the exception that the cleaning brush apparatus 408 is mounted directly to a lower portion 411 of a front side 424, such as to a front rail, of a platform 406. The cleaning brush apparatus 408 is configured to be fixedly mounted so as to allow the operator 201 access to the cleaning brush apparatus 408 from an operator station 428. This location of the cleaning brush apparatus 408 leaves sufficient space on the platform behind the cleaning brush apparatus 408 to define a walkway to the rear of the cleaning brush apparatus 408 that permits the human operator 201 to walk on the platform 406 behind the brush and along at least a portion of the length of the brush, for example along the entire length of the brush or from one end of the platform to the other end. In some embodiments, the cleaning brush apparatus 408 is positioned along the entire length of the platform 406 and, in other embodiments, the cleaning brush apparatus 408 is positioned along a portion of the length of a platform 406.

FIGS. 10A and 10B depict a building cleaning system 500 in accordance with the principles of the present disclosure. The cleaning system 500 can include a suspended platform 506. In certain examples, the platform 506 can be a platform compatible with a davit system (e.g., a platform like the platform in FIGS. 1 and 2), a platform compatible with a building maintenance unit (BMU) system, or a platform compatible with a temporary roof-top rig. The system 500 also includes a cleaning brush apparatus 508 that mounts directly beneath a base 507 of the suspended platform 506. In one example, the cleaning brush apparatus 508 is a powered cleaning structure that automatically cleans the windows of the building 21 as well as portions of the building between the windows as the platform 506 is raised and lowered along the building side.

The cleaning brush apparatus 508 can include a cleaning brush element 505 such as a brush that is powered/driven (e.g., rotated or otherwise moved) by a motor. In one example, the cleaning brush apparatus 508 includes a cylindrical cleaning brush element 505 (e.g., a cylindrical brush structure) that is rotated by a motor 509 about a rotation axis 536. In one example, the cleaning brush element 505 can include flexible radial cleaning elements such as bristles, flaps, or strips. In one example, the rotation axis 536 extends along a length of the platform 506. In one example, the rotation axis 536 is parallel to the base 507 of the platform 506. In one example, the cleaning brush apparatus 508 includes a cylindrical brush having a length that extends along a length of the platform 506, the cylindrical brush being rotatable about a central longitudinal axis of the cylindrical brush. In one example, the cleaning brush element 505 (e.g., a cleaning brush) is mounted and configured such that at least a portion remains directly beneath the platform base 507 of the platform 506 during cleaning of the building. In one example, the cleaning brush element 505 is mounted and configured such that at least a majority of the cleaning brush element 505 (e.g., a cleaning brush) remains directly beneath the platform base 507 during cleaning of the building. In one example, the cleaning brush element 505 is mounted and configured such that an axis of rotation of the cleaning brush element 505 (e.g., a cleaning brush) remains directly beneath the platform base 507 during cleaning of the building. In one example, the cleaning brush element 505 includes a cylindrical brush having a length and a longitudinal axis of rotation that extend along the length of the platform 506, and the cylindrical brush is mounted and configured such that at least 25 percent of the brush remains directly beneath the platform base 507 during cleaning of the building. In one example, the cleaning brush element 505 includes a cylindrical brush having a length and a longitudinal axis of rotation that extend along the length of the platform 506, and the cylindrical brush is mounted and configured such that at least 50 percent of the brush remains directly beneath the platform base 507 during cleaning of the building. In one example, the cleaning brush element 505 includes a cylindrical brush having a length and a longitudinal axis of rotation that extend along the length of the platform 506, and cylindrical brush is mounted and configured such that the axis of rotation of the brush remains directly beneath the platform base 507 during cleaning of the building. In one example, the cylindrical brush has a length longer, shorter, or about the same as the length of the platform 506. In one example, the cylindrical brush has a length that extends for at least a majority of the length of the platform 506. In one example, the cleaning brush apparatus 508 includes a frame 538 secured by one or more fastening elements 513 (e.g., clamps, brackets, fasteners) to the platform base 507. In one example, the cleaning brush apparatus 508 includes a shroud 515 that surrounds a portion of the cleaning brush element 505. In one example, the cleaning brush apparatus 508 includes a shroud 515 that surrounds a portion of the cylindrical cleaning brush 505. In one example, the cleaning brush element 505 is movable relative to the frame 538 and relative to the platform 506 to maintain contact with the building surface 102 during cleaning (i.e., washing) of the surface 102. Such movement (as shown by an arrow 541) allows the cleaning brush element 505 to be adjusted. In one example, the cleaning brush element 505 is spring loaded so as to allow the cleaning brush element 505 to slide along the width of the frame 538 when the cleaning brush element 505 encounters an obstruction. In such an example, once the cleaning brush element 505 clears the obstruction, it can spring back into place in a direction toward the building surface 102. In other examples, the cleaning brush element 505 can be moved using gears, levers, pneumatic actuators, hydraulic actuators, electrically powered actuators, etc.

In one example, the cleaning brush apparatus 508 does not include a fan for forcing the cleaning brush element 505 toward the surface 102 during cleaning of the surface 102.

The cleaning brush apparatus 508 can also include an obstruction bar 539 positioned at a bottom side of the cleaning brush apparatus 508. The obstruction bar 539 is configured to alter the operations of the cleaning brush apparatus 508 and/or the platform 506 when the obstruction bar 539 contacts an obstruction. In some embodiments, the obstruction bar 539 can interface with a controller that controls the operation of a hoist system and the operation of the cleaning brush apparatus 508 so that when an obstruction is encountered, the controller automatically shuts down the operation of the hoist system and/or the cleaning brush apparatus 508. The obstruction bar 539 interfaces with mechanical or electronic control devices such that actuation of the bar 539 by an obstruction causes the hoist system and/or the cleaning brush apparatus 508 to shut down. In the case where the cleaning brush apparatus 508 is a retrofit device used to retrofit an existing platform by adding the cleaning brush apparatus 508 to the bottom of the platform 506, existing wheels and an existing obstruction bar of the platform 506 can be removed to facilitate mounting the cleaning brush apparatus 508. In such a case, the cleaning brush apparatus 508 can include the obstruction bar 539 that performs the same function as the obstruction bar removed from the platform 506.

In one example, the cleaning brush apparatus 508 is a powered cleaning apparatus having one or more cleaning brush elements that are driven relative to the platform 506 by a power source. In certain examples, the brush or brushes are driven in a rotary motion relative to the platform. In certain examples, the power source includes one or more motors such as one or more electric motors, or one or more combustion engines. In some examples, the cleaning brush apparatus 508 is a specialty manufactured apparatus. In some examples, the cleaning brush apparatus 508 can be an add-on device that can be added to an existing platform to temporarily or permanently retrofit the platform so as to include automated cleaning features. Alternatively, the cleaning brush apparatus 508 can be incorporated into the platform at the time the platform is initially manufactured. In other examples, an existing pre-manufactured platform can be modified to include the cleaning brush apparatus 508.

The cleaning system 500 can be used to clean the upright surface 102 of a building (e.g., a skyscraper or high-rise building). The upright surface 102 can be the side of the building including, for example, windows or the structure of the building between the windows. The platform 506 of the cleaning apparatus 500 can be raised and lowered along the surface 102 of the building by a davit system or a BMU system, and can be stabilized relative to the building by suitable stabilization structures (e.g., mullion guide systems, tie-in systems, button guide systems). The cleaning system 500 is shown cleaning the upright surface 102. The platform 506 of the cleaning system 500 is configured to move in a vertical direction along the upright surface 102 during cleaning.

With continued reference to FIGS. 10A and 10B, the cleaning brush apparatus 508 is adapted to contact the upright surface 102 during cleaning. Specifically, the cleaning brush apparatus 508 is configured to automatically clean the upright surface 102 as the platform 506 travels vertically along the upright surface 102 during operation. The cleaning brush apparatus 508 uses a power source, such as a battery, power cord or other external power source, and a water source (i.e., a hose) along with a spray nozzle 511 to clean the upright surface 102. In some examples, the power cord and hose can be routed from the roof of the building.

FIG. 11 shows a schematic top view of a cleaning system 600. The cleaning system 600 is similar to the cleaning systems 100, 200, 300, 400, 500 described above with the exception that an operator station 628 is secured to a rear 625 of the cleaning system 600. Specifically, a cleaning brush apparatus 608 is positioned at a front side 624 of a platform of the cleaning system 600. The cleaning brush apparatus 608 is longer than the operator station 628. In some examples, the operator station 628 is movable along the length of the cleaning brush apparatus 608.

FIGS. 12-15 illustrate another example of a cleaning system 700. The cleaning system 700 is similar to the cleaning systems 100, 200, 300, 400, 500, 600 described above including a cylindrical brush apparatus 702 mounted on a platform 704, with the cylindrical brush apparatus 702 having a cylindrical rotating brush 706 to clean an interior or exterior surface of a building. In the system 700, the cylindrical brush apparatus 702 is mounted on the platform 704 in a manner to define a walkway 708 (FIG. 15) on the platform 704 that permits a human operator to walk on the platform 704 behind the rotation axis of the brush 706 along at least a portion of the length of the brush 706, for example behind the brush 706 along at least a portion of the length of the brush, for example along the entire length of the brush or from one end of the platform 704 to the other end. Rather than mounting the cylindrical brush apparatus below the platform like in FIGS. 7-8, 10A and 10B, or at front side of the platform like in FIG. 9, the cylindrical brush apparatus 702 is mounted to a front wall or front frame of the platform 704, for example over a front guard rail 710 of the platform 704 with the brush 706 positioned well above a floor 709 of the platform 704. In this example, the rotation axis of the brush 706 is vertically above the front guard rail 710. In addition, the rotation axis of the brush 706 is forward of the front guard rail 701. The front guard rail 710 forms part of a front wall or front frame of the platform 704, and a rear guard rail 711 forms part of a rear wall or rear frame of the platform 704. The front guard rails 710, together with the rear guard rail 711, help form a wall or barrier to define a partially enclosed working station in which one or more human operators can work.

The cylindrical brush apparatus 702 is also adjustably mounted to the front wall of the platform 704 in a manner to permit sliding adjustment, relative to the platform 704, of the position of the cylindrical brush apparatus 702 along the length of the platform 704 parallel to a longitudinal axis A-A of the platform 704. The cylindrical brush apparatus 702 can be adjustably mounted to the front wall in any suitable manner that permits the adjustment of the cylindrical brush apparatus 702.

In the illustrated example, the adjustable mounting is provided by a rail system that includes front and rear fixed carriage rails 712 a, 712 b and carriages 716 on the cylindrical brush apparatus 702 that are slidably disposed on the carriage rails 712 a, 712 b. The carriage rails 712 a, 712 b are parallel to one another, parallel to the front rail 710, and parallel to the longitudinal axis A-A. The carriage rails 712 a, 712 b are located a distance above the front rail 710 and to the front and rear, respectively, of the front rail 710. The carriage rails 712 a, 712 b can extend any desired length of the platform 704. In the illustrated example, the carriage rails 712 a, 712 b extend substantially the entire length of the platform 704 to permit the cylindrical brush apparatus 702 to be adjusted in position along the entire length of the platform 704.

The carriage rails 712 a, 712 b can be removably mountable on the platform 704 via a plurality of supports 714 along the length of the carriage rails 712 a, 712 b. This permits the adjustable mounting system described herein to be retrofitted onto an existing platform by installing and removing the carriage rails 712 a, 712 b onto and from the existing platform. Alternatively, the carriage rails 712 a, 712 b can be permanently installed onto an existing platform, or incorporated into a newly constructed platform, whereby the carriage rails 712 a, 712 b are not intended to be removed from the platform.

The cylindrical brush apparatus 702 includes a base frame 718 to which the carriages 716 are secured for slidably supporting the cylindrical brush apparatus 702 on the carriage rails 712 a, 712 b. The base frame 718 can be substantially horizontal or parallel to the floor 709 of the platform 704. Any number of carriages 716 can be provided as long as adequate sliding is achieved. In the illustrated example, there are two carriages 716 at a front side of the base frame 718 and two carriages 716 at a rear side of the base frame 718. As best seen in FIG. 13, each carriage 716 can have a set of rollers 720 rolling on an upper surface of the carriage rails 712 a, 712 b. The two carriages 716 and the rollers 720 thereon at the front side of the base frame 718 face forwardly or toward the front of the platform 704 and the two carriages 716 and the rollers 720 thereon at the rear side of the base frame 718 face rearwardly or toward the rear of the platform 704.

The base frame 718 further includes end bars 722 at each end thereof (best seen in FIGS. 13 and 14) that in use slidably support the portions of the cylindrical brush apparatus 702 above them including the brush 706 in a manner to permit the position of the brush 706 to be adjusted, relative to the platform 704, toward and away from the exterior surface of the building, or toward and away from the front side of the platform 704, or in a direction perpendicular to the carriage rails 712 a, 712 b. The cylindrical brush apparatus 702 includes a pair of vertical support frames 724 at each end thereof, with the support frames 724 disposed on vertical support frame plates 726. Each plate 726 is detachably secured to the end bars 722, for example by a plurality of bolts. The bolts can be removed to permit the plate 726 and the remainder of the brush apparatus 702, to be adjusted toward or away from the exterior surface of the building. Alternatively, the cleaning brush apparatus 702 may be spring loaded with the cleaning brush apparatus 702 biased toward the front of the platform 704, and which allows the vertical support frames 724 and the cleaning brush 706 thereon to slide along the width of the platform 704 away from the building surface if the cleaning brush 706 encounters an obstruction, with the cleaning brush 706 then being biased back into position toward building surface when the obstruction is cleared. For example, as illustrated in FIG. 14, one or more springs 725 (shown in broken lines) or other resilient biasing devices may be provided in or near one or both of the end bars 722 and that act on the support frame(s) 724 to spring load the cleaning brush apparatus 702 so that the cleaning brush apparatus is biased in a direction toward the front of the platform 704 or in a direction toward the building surface.

The brush 706 is rotatably mounted on the vertical support frames 724. The brush 706 includes a shaft 730 with opposite ends rotatably supported by bearings in the support frames 724. At least one motor 732 (see FIG. 13) is in driving engagement with the shaft 730 to rotate the shaft 730 and thereby rotate the brush 706. Referring to FIG. 12, the brush 706 can be formed by a single brush element, or by two or more brush elements 706 a, 706 b arranged side-by-side. As best seen in FIGS. 13 and 14, shaft extensions 734 extend from each end of the shaft 730 and roller bumpers 736 may optionally be mounted on the shaft extensions 734. The shaft extensions 734 are collinear with the rotation axis of the shaft 730, and are fixed relative to the shaft 730. The roller bumpers 736 are rotatably disposed on the shaft extensions 734. In use, the roller bumpers 736 are positioned and sized to roll along the exterior surface of the building during cleaning. The roller bumpers 736 can be made of an elastomeric material such as rubber or a plastic material.

A cross-bar 738 is connected to and extends between the support frames 724. The cross-bar 738 acts as a manifold for water or other cleaning solution. The cross-bar 738 can be hollow to allow passage of water or other cleaning solution therein, or allow passage of a hose that carries the water or other cleaning solution. An inlet fitting 740 is provided at one or both ends of the cross-bar 738 to allow connection to a hose supplying the water or other cleaning solution. A valve 742 is provided on the inlet 740 to allow manual or automatic control of the incoming fluid. A plurality of spray nozzles 744 are provided along the length of the cross-bar 738 which act as outlets to spray fluid onto the exterior surface of the building and/or spray fluid onto the brush 706 prior to or during cleaning.

Referring to FIG. 14, a fixed or stationary shroud 746 at least partially surrounds the rear half of the brush 706 (i.e. the half of the brush further from the building surface during use) to prevent unwanted overspray caused by the rotation of the brush 706. In the illustrated example, the shroud 746 extends approximately 180 degrees around the brush 706. The shroud 746 is fixed to the vertical support frame plates 726 and to the cross-bar 738 so that the shroud 746 does not rotate. The shroud 746 prevents contact between the human operator and the rotating brush 706, and prevents unwanted overspray caused by the rotation of the brush 706.

FIG. 12 shows the platform 704 as having a length that is greater than the length of the cylindrical brush apparaltus 702 to permit the brush apparatus 702 to be adjusted in position lengthwise along the length of the platform 704. However, some platforms are smaller in length than the platform 704. For example, referring to FIG. 16, a platform 800 is illustrated that is about a third of the length of the platform 704 in FIG. 12. In FIG. 16, the same or similar cylindrical brush apparatus 702 as used in FIG. 12 can be mounted to the front wall of the platform 800 over the front rail of the platform. In this example, the length of the cylindrical brush apparatus 702 is about the same as the length of the platform 800. A walkway is still defined on the platform 800 similar to the one in FIGS. 12-15 that permits a human operator to walk on the platform 800 behind the brush.

In operation of FIGS. 12-15 (the operation of the example in FIG. 16 is similar), to clean a surface of a building, for example an upright exterior surface of the building, the brush apparatus 702 is mounted to the platform 704 in a manner to define a walkway on the base of the platform 704 that permits a human operator to walk on the base of the platform behind the brush along at least a portion of the length of the brush, for example along an entire length of the platform. For example, as described above, the brush apparatus 702 can be mounted to the front wall of the platform, such as over the front rail of the platform. The brush apparatus may also be adjustably mounted to permit the position of the brush apparatus along the length of the platform to be adjusted. The platform is then suspended from the building with the human operator on the platform and the front of the platform facing the surface to be cleaned. The platform is also stabilized relative to the building by suitable stabilization structures. The platform can then be raised and/or lowered along the surface while the cleaning brush rotates in contact with the surface to thereby clean the surface using the brush. At the end of a travel sequence (i.e. either raised or lowered along the surface), the brush apparatus may be shifted in position laterally on the platform, and the platform again raised or lowered to clean a next adjacent section of the building surface. Alternatively, the platform may be shifted laterally relative to the building while the relative positions between the brush apparatus and the platform remains the same, and the platform again raised or lowered to clean a next adjacent section of the building surface. This process can be repeated as many times as necessary to clean the entire exterior surface of the building.

The examples disclosed in this application are to be considered in all respects as illustrative and not limitative. The scope of the invention is indicated by the appended claims rather than by the foregoing description; and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein. 

1. A cleaning system that is configured to clean a surface of a building, comprising: a platform that is suspendable from the building, the platform has a longitudinal axis, and the platform is configured to support at least one human operator during use when suspended from the building; a cleaning brush apparatus mounted on the platform, the cleaning brush apparatus includes a cleaning brush that is rotatable relative to the platform about a rotation axis that is parallel to the longitudinal axis of the platform; the cleaning brush apparatus is slidably mounted on the platform to permit the cleaning brush apparatus to be adjusted in position on and relative to the platform in a direction parallel to the longitudinal axis.
 2. The cleaning system of claim 1, wherein the cleaning brush apparatus is slidably mounted to the platform by a rail system that includes front and rear carriage rails fixed to the platform and carriages mounted on the cleaning brush apparatus and slidably supported on the front and rear carriage rails.
 3. The cleaning system of claim 1, further comprising a shroud around at least a portion of the cleaning brush.
 4. The cleaning system of claim 2, wherein the carriage rails are removably fixed to the platform.
 5. The cleaning system of claim 1, wherein the platform has a length that is greater than a length of the cleaning brush.
 6. The cleaning system of claim 1, wherein the brush has a length, and further comprising a walkway defined on the platform to the rear of the rotation axis that permits the at least one human operator to walk on the platform to the rear of the rotation axis along at least a portion of the length of the brush.
 7. The cleaning system of claim 6, wherein the walkway permits the human operator to walk on the platform to the rear of the rotation axis along the entire length of the brush.
 8. The cleaning system of claim 6, wherein the walkway permits the human operator to walk on the platform to the rear of the rotation axis along an entire length of the platform from one end of the platform to an opposite end.
 9. The cleaning system of claim 1, wherein the cleaning brush apparatus further includes a plurality of spray nozzles that are configured to spray fluid onto the surface of the building and/or spray fluid onto the cleaning brush prior to or during cleaning.
 10. The cleaning system of claim 1, further comprising stabilization structure connected to the platform for stabilizing the platform relative to the building.
 11. A cleaning system that is configured to clean a surface of a building, comprising: a platform that is suspendable from the building, the platform has a longitudinal axis, and the platform is configured to support at least one human operator during use when suspended from the building; a cleaning brush apparatus mounted on the platform, the cleaning brush apparatus includes a cleaning brush that is rotatable relative to the platform about a rotation axis that is parallel to the longitudinal axis of the platform, the cleaning brush having a length; and a walkway defined on the platform to the rear of the rotation axis that permits the at least one human operator to walk on the platform behind the rotation axis along at least a portion of the length of the cleaning brush.
 12. The cleaning system of claim 11, wherein the platform includes a front wall, and the cleaning brush apparatus is mounted on the front wall, and the walkway is located behind the cleaning brush apparatus.
 13. The cleaning system of claim 11, wherein the walkway permits the human operator to walk on the platform to the rear of the rotation axis along the entire length of the cleaning brush.
 14. The cleaning system of claim 11, wherein the walkway permits the human operator to walk on the platform to the rear of the rotation axis along an entire length of the platform from one end of the platform to an opposite end.
 15. The cleaning system of claim 11, wherein the cleaning brush apparatus further includes a plurality of spray nozzles that are configured to spray fluid onto the surface of the building and/or spray fluid onto the cleaning brush prior to or during cleaning.
 16. The cleaning system of claim 11, further comprising stabilization structure connected to the platform for stabilizing the platform relative to the building. 